Dissociative electron attachment dynamics of carbon disulfide and violation of axial recoil approximation near the 6-eV resonance

TL;DR

This study investigates the dissociation dynamics of low-energy electron attachment to carbon disulfide using velocity slice imaging, revealing resonance behaviors and deviations from axial recoil approximation.

Contribution

It provides detailed experimental insights into the resonance structures and angular distributions of fragment ions, highlighting bending effects in temporary negative ions.

Findings

Resonances at 6.2 eV and 7.7 eV for S- ions.

Single resonance at 6.2 eV for CS- ions.

Deviation from axial recoil approximation due to bending of negative ions.

Abstract

Complete dissociation dynamics of low-energy electron attachment to carbon disulfide have been studied using the velocity slice imaging (VSI) technique. The ion yields of S- and CS- fragment ions as the function of incident electron energy in the range 5 to 11 eV have been obtained. Two resonances for S- ions at around 6.2 eV and 7.7 eV and only one resonance for CS- ions at around 6.2 eV have been obtained in this energy range. The kinetic energy and the angular distributions of these fragment negative ions at different incident electron energies around these resonances have been measured. From the angular distribution of these fragment anions, we have found that the bending of the temporary negative ions causes a significant change in the angular distribution from the expected one.